Japanese Knotweed is edible and is eaten as Sansai in Japan. Some places in the United States use the white flowers to extract a kind of honey. While this may work okay for some, a lot of places outside of East Asia have issues because of the invasiveness of this plant. The U.K. has a lot of problems with Japanese Knotweed because it populates many places taking up nutrition from other plants. It causes damages to construction sites as well as being a problem for any weakened concrete.
- Whilst one dose of total herbicide will eradicate a Buddleia plant, Japanese knotweed requires years of treatment to attain a measure of control.
- Whilst it is not illegal to have Japanese knotweed growing at a property, it is subject to a number of pieces of legislation.
- Where land is contaminated with Japanese knotweed, this area is deemed unusable and restricted space and therefore has an implication to the property in question.
“Japanese knotweed is a perennial plant, dying back each winter leaving its canes behind following each growing season.”